Original after credits scene.
When I saw this in theatres at one of those Neilson preview things, the original after credits scene was basically the same, but didn't end with the abrupt shock.
The original was: the killers were approaching the lady and as soon as she turned to enter her house the cops raided the killers and it turns out that it all was a sting operation. Then you see Justine drive off in the killers car from the beginning.
For me, it seems that was a better ending. This quick cut comes off as more of a, leave room for potential sequel type.